AVAudioPlayer return wrong duration when MP3 File's magic number is 49443302

//
//  ContentView.swift
//  testAudioPlayer
//
//  Created by 김수환 on 6/7/24.
//

import SwiftUI
import AVFoundation

struct ContentView: View {
    @State var duration: Double = 0
    
    var body: some View {
        VStack {
            Button {
                guard let audioURL = Bundle.main.url(
                    forResource: "example",
                    withExtension: "mp3"
                ) else {
                    return
                }
                guard let audioplayer = try? AVAudioPlayer(contentsOf: audioURL) else {
                    return
                }
                duration = audioplayer.duration
                
            } label: {
                Text("press to check example1's duration")
            }
            .padding(.bottom, 30)
            
            Button {
                guard let audioURL = Bundle.main.url(
                    forResource: "example2",
                    withExtension: "mp3"
                ) else {
                    return
                }
                guard let audioplayer = try? AVAudioPlayer(contentsOf: audioURL) else {
                    return
                }
                duration = audioplayer.duration
                
            } label: {
                Text("press to check example2's duration")
            }
            .padding(.bottom, 30)
            
            Text("duration: \(duration)")
        }
        .padding()
    }
}